<template>
  <div>
    <div id="app">
      <div>
        <div style="display: inline-block" v-for="(item) in arr" :key="item">
          <input type="checkbox" @click="add" :value="item" v-model="list" />
          <span>{{ item }}</span>
        </div>
        <p>你选中的元素, 累加的值和为: {{add}}</p>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      list: [],
    };
  },

  computed: {
    add() {
     return this.list.reduce((t, c) => t + c, 0);
    },
  },
};
</script>

<style>
</style>